Feeding drive mechanism for mining machines



May 12, 1953 A. L. LEE

FEEDING DRIVE MECHANISM FOR MINING MACHINES 1o Shets-Sheet 1 Original Filed April 6, 1945 AIP'THUE L. LEE,

May 12, 1953 A-. L. LEE I 2,638,332

FEEDING DRIVE MECHANISM FOR MINING MACHINES Original Filed April 6. 1945 10 Sheets-Sheet 2 QMWI' ARTHUR L La 12, 1953 A. L. LEE 2,633,332

FEEDING DRIVE MECHANISM FOR MINING MACHINES Original Filed April 6. 1945 10 Sheets-Sheet I5 ARTHUR L LEE,

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FEEDING DRIVE MECHANISM FOR MlNING MACHINES Original Filed April 6, 194? 10 Sheets-Sheet 4 y 2, 1953 A. L. LEE 2,638,332

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FEEDING DRIVE MECHANISM FOR MINING MACHINES 1o Sheets-Sheet 6 Original Filed April 6. 1945 Elma/rm;

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FEEDING DRIVE MECHANISM FOR MINING MACHINES Original Filed April 6. 1945 May 12, 1953 May 12, 1953 A. L. LEE

FEEDING DRIVE MECHANISM FOR MINING MACHINES 10 Sheets-Sheet 9 Original Filed April 6, 1945 m gnaw W0 q ARTHUR L. LEE,

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FEEDING DRIVE MECHANISM FOR MINING MACHINES Original Filed April 6, 1945 10 Sheets-Sheet 10 V 22' 22? 30'? lll fi ylL M 4] g 303 310 22| I], 22 vs?! 1 3 225 6 & [1 .24 30! i0; 17 4 Jrwmiw 308 24 ARTHUR Er:,

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Patented May 12, 1953 FEEDING DRIVE MECHANISM FOR MINING MACHINES Arthur L. Lee, Upper Arlington, Ohio, assignor to The J eifrey Manufacturing Company, a corporation of Ohio Original application April 6, 1945, Serial No. 586,979. Divided and this application June 12, 1946, Serial No. 676,200

8 Claims.

This invention relates to a mining machine and in the specific embodiment thereof disclosed in detail and in its most specific aspect it relates to a mining machine of the shortwall type, but it may be employed in other machines, such for example as longwall, longwall-shortwall, or arcwall mining machines.

One object of the invention is to provide improved gearing and control means in a mining machine.

Another object of the invention is to provide a mining machine having an improved feeding drive gearing including a hydraulic fluid coupling through which driving forces are transmitted to a feeding drum and a hydraulically operated clutch by which the feeding drum may be connected with and disconnected from the drive gearing and in which avariable relief valve for controlling the hydraulic fluid coupling and a control valve for the hydraulic clutch are in terlocked to cause proper cooperation of said hydraulic coupling and said hydraulic clutch.

In carrying out the foregoing object it is a further object of the invention to provide an improved means for interlocking the variable relief valve for the hydraulic fluid coupling and the valve for the clutch which interlocking means is an operating means for the valves and may be operated from either side of the mining machine.

A further object of the invention is to provide a mining machine having a reversible motor and spaced feed drums including mechanism to provide for driving the drums always in the same direction, regardless of the direction of rotation of the motor.

Another and more specific object of the invention is to provide a mining machine having improved feeding device drive means which drive means may be the feeding drums of the mining machine, the drive means including a large gear adapted to be driven in reverse directions by the driving motor of the machine and reversible drive means driven from the large gear including clutches adapted selectively to drive the feeding means always in the same direction.

Still another object of the invention is to provide in the improved drive gearing set forth in the preceding object a gear that meshes with the large gear and from which a drive mechanism different from the feeding drive means mentioned may be driven.

A further object of the invention is to provide simple control mechanism for both a two-speed feed control mechanism and a fluid coupling mechanism on a mining machine, one being preferably controlled by rectilinear or reciprocatory motion, the other by rotary motion of the common control shaft, and in the more specific embodiment of the invention the control to be'duplicated on opposite sides of the vehicle and also preferably providing for similar operation to produce similar results.

Other objects of the invention will appear hereinafter, the novel features and combinations being set forth in the appended claims.

In the accompanying drawings,

Fig. 1 is a plan view of a shortwall type machine which incorporates the features of my-invention, the cutter bar being shown cut short;

Fig. 2 is a side elevational view of the machine of Fig- 1; 1

Fig. 3 is a vertical sectional view of they-rear portion of the machine, taken substantially through the center thereof, showing particularly the machinery frame compartment and the gummer or cuttings removing mechanism, some parts being eliminated in the interest of clearness;

Fig. l is a plan View, with parts in sectional plan, showing a portion of one gear train branch leading to the right hand feed drum; it being understood that the parts are duplicated on the other side of the machine, the parts shown being in the machinery section;

Fig. 5 is an end elevational view of the hydraulic fluid coupling, with one cover plate broken away and a portion of the rotor shown in section;

Fig. 6 is a sectional view through the casing or housing of the fluid coupling, the rotor being shown in elevation;

Fig. '7 is a sectional view taken on the line I of Fig. 6, looking in the direction of the arrows;

Fig. 8 is a front elevational view of a twospeed planetary gearing for one of the drums. with parts broken away and shown in section;

Fig. 9 is a sectional elevational view of the two-speed planetary gearing of Fig. 8;

Fig. 10 is an end view of one of the rope 0 feed drums, with parts broken away and shown in section;

Fig. 11 is a sectional elevational view taken on the line H--I! of Fig. 10, looking in the direction of the arrows;

Fig. 12 is a sectional view taken on the line l2-l2 of Fig. 10, looking in the direction of the arrows;

Fig. 13 is a sectional plan view showing various hydraulic controlvalves of a combination or valve assembly which is mountable as a unit on one corner of the mining machine frame;

Fig. 14 is a sectional view taken on the line |4-|4 of Fig. 13, looking in the direction of the arrows;

Fig. 15'is'an elevational view ofone ,side of the valve block or assembly 'shownin Figs. 13 and 14;

Fig. 16 is a sectional view taken on the line |6-|6 of Fig. 14, looking in the direction -of the arrows;

Fi 17 is a sectional elevational view taken on Fig. 21- is a sectional view taken on the line :2|..2:| of Fig. 14 of the drawings;

Fig. 22 is a sectional view taken on the'line 22-22 of Fig. 15 of the drawings;

Fig. 23 is a sectional view of both the high pressure and the sump pumps and the .drive mechanism therefor, including a one-way driving clutch which is an important element of the gear train leading to the feed drums;

Fig. 24 is a sectional view taken on the line 24-24 of Fig. 23, looking-in the direction of the arrows; and

Fig. 25 is a piping diagram as well as a schematic showing of certain parts of the mining machine, including particularly the various compartments and valve assemblies thereof.

This application is a division of my application Serial No. 586,979, filed April 6, 1945, for a Mining Machine.

Referring first to Figs. 1 and 2 of the drawings, the mining machine includes a main frame 40 which in practice is preferably formed of two substantially independent frames including a forward motor frame or section 4| and a rearward machinery frame or ,section 42, the two frames or sections 4| and 42 being removably connected together as by machine screws -or bolts. Removably attached to the rear end of the machinery frame or section 42 is a gummer ,or cuttings removing mechanism 43 which as hereinafter pointed out more completely is optionally employed or omitted.

Extending forwardly from the motor frame or section 4| is a kerf-cutting mechanism 44 including an elongated cutter bar .45 which is of substantially standard construction and upon which there is mounted an endless cutter chain 46 provided with removable and reversible cutter bits 41. As is well known, the shortwall type of mining machine is adapted to be fed as a unit over the mine floor while cutting a kerf, the kerf being cut by first sumping the cutter bar into the solid coal and then feeding the machine laterally or across the coal face, all the while the kerf cutting mechanism 44 is in operation.

To effect the feeding of the mining machine as a unit, both at a kerf cutting speed and at '7 a handling or higher speed and in reverse directions, the machine includes a pair of feed cable or rope drums 48 and 49 mounted on horizontal axes which are preferably in alignment, one on one side of the machine, the other on the 4 other, as clearly illustrated in Fig. 1 of the drawings.

Drums 48 and 49 are provided with feed ropes or cables 5.0 andr5| respectively, which-are adapt- .ed to Lbe-reeved about the sheaves of similar right and left hand rear sheave assemblies 52 and 53, respectively, and/or similar right and left hand frcntsheave assemblies 54 and 55, respectively.

For the present it need only be pointed out that the driving motor which drives the drums 48 and 49. tendsto drive them always in the same direction, regardless of the direction of rotation of the motor, and that direction is such that it tends always to wind or pull in said ropes 5| and 5|. That is, drum 48 tends always to be rotated by its driving motor in a clockwise direction, as viewed by a person facing it, and drum 49 tends .always ,to rotate in a counterclockwise direction,

as viewed-by a" person -f acing it.

As further pointed out hereinafter, the mining machineimay out ocal by being fed laterally in reverse directions and to do this, slippage is provided on one of the drums 48 or 49, as the case 'may be, and it is allowed to pay out with a variable pull on the associated rope, as -de- 'termined by the control of the associated fluid coupling. In'Fig. 10f the drawings the machine is illustrated with the ropes 59 and 5| reeved about the pulleys 452 and 55 to effect a lateral feeding ofthe machine to the left, as viewed from 'the rear thereof, or upward, as viewed from the drawings.

By the mere expedient of reeving rope 50' about the sheave of front assembly 5'4 and reeving rope 51' about the sheave of sheave assembly 53 and making the necessary operating adjustments on the machine, it maybe fed to the right, reversely of that illustrated in said Fig. 1 of the drawings.

By extending both of the feed ropes 50 and 5| directly forwardly and to mine jacks, the machine may be fed forwardly and sumped into the solid coal. By extending the rope 59 rearwardly and around an auxiliary sheave 56, then laterally to acentralsheave not-illustrated but which is common on machines .of this type, the machine can be pulled rearwardly away from the mine face and may beloaded onto a truck in a manner well understood in the operation of shortwall machines.

The shortwa'll mining machine illustrated is. of course, adapted to rest on and slide over the mine floor when in operation and the supporting surfaces of the machine are provided largely by four spaced hydraulic piston jacks or motors (when employed), those at the rear being designated 5'! and those at the front being designated 58. Thesehydraulic jacks provide for adjusting the elevation of the cutter mechanism 44 or, in other words, the effective height of the machine and also provide for adjusting the inclination or tilt thereof on right; angularly related axes relative to a horizontal plane, as hereinafter described more completely.

Attention is now directed particularly to Fig, 3 of the drawings and to some of the machinery or gearing which is contained within the machinery section 42 which includes the drive gearing leading to the cutter chain 46 and to the drums 413 and 49, as well as other mechanism which will be specifically pointed out.

Extending from the motor section 4| into the machinery section 42 is the end of a hollow drive shaft 59, which in the machine illustrated is the armature shaft of the motor housed within frame M, and which is supported at its outer end on an anti-friction bearing 69 which in turn is sup ported on a web or integral bracket formed on the frame 42 which provide a substantially totally enclosing housing for the machinery or gears therein.

Keyed adjacent the end of the shaft 59 is a pinion 6| which meshes with a larger pinion 62 keyed to a shaft 63 having an integral bevel pinion 64, the shaft 63 being mounted in spaced bearings within the housing or frame 42. Pinion 64 meshes with a large bevel ring gear 65, the hub of which is mounted in a roller bearing 66 carried in a bearing cup in a removable top plate 6'! which is removably attached to the frame 42 and forms a part of the enclosure or housing provided thereby. The hub of ring gear 65 is also mounted on spaced. needle bearings 66 by which it is mounted for free rotation on a vertical or upstanding shaft :59, to the bottom of which a drive sprocket 16 for the cutter chain 46 is provided.

The drive shaft 66 extends through a hole in an elevated integral bottom plate H of the frame or section 42, which is preferably formed as a single steel casting, and is supported principally on a roller bearing 52 received in a removable cup ?3 which is attached to the bottom plate H as by machine screws.

Since the sprocket it! is, of course, exposed to the atmosphere and is outside the enclosure provided by the enclosing frame or section 42, within which enclosure there is a considerable amount of lubricating oil, though it is not filled with oil, oil seals are provided to prevent oil leakage. First of all, there is a pair of oil seals M provided adjacent the opening through which shaft 69 extends and a ring l5 which preferably has a tight fit with the shaft es. Lubrication for the bearing '52 is provided by an oil catcher i6 and a pipe I! which leads by way of a passageway around the seals M to the bearing 12. Oil seals at the bottom of the bearing 72 between the bottom of the cup 73 and the sprocket 16 are provided by a piston ring it, a felt packing i9 and a labyrinth type seal 68. Obviously, other forms of oil or grease packing may be employed for those illustrated and described.

From the above description it is evident that the shaft 69 is supported in the frame or section d2 by the bearing 72 at the bottom and by the combined actions of the top bearing 66 and the needle bearing 68 through the intermediary of the hub of ring gear 65. It is further evident from the above description that there is not a permanent or direct driving connection from the ring gear 65 to the shaft 69, but on the contrary the ring gear 655 is free to rotate on said shaft 69. To support the ring gear 65 on the shaft 69 against downward axial movement, there is a thrust ball bearing 8| interposed between a shoulder on the shaft 59 and the bottom of the hub of said gear 65.

Mounted concentric with the ring gear 65 and the shaft 69 and keyed onto the hub of said ring gear 5-5 is a bevel gear Gears 65 and 82 therefore always rotate together and each is directly driven from the drive shaft 59 and always rotates with it.

At its bottom portion the gear 82 forms a driving portion of a jaw clutch and is provided with clutch dogs 33. Providing the driven portion of said clutch is a shiftable collar 8d having dogs adapted to be engaged with or disengaged from thedogs 83. Collar 84 is shiftable upwardly and downwardly on the shaft 69 and is splined or keyed thereto so that whenever it is driven, a driving relation is effected to said shaft 69. A bifurcated shipper 85 mounted on a rotary horizontal clutch shaft 86 is provided for operating the clutch 83-6-t, which clutch, obviously, is the clutch for effecting a driving or non-driving relation from the driving motor Within the motor section M to the kerf cutter chain 46.

The operating shaft 86 is carried in appropriate bearings and at one side (see Fig. 4) is provided with an upstanding lever 61 to which a forwardly extending rod 86- is connected, which rod in turn is connected to a downwardly extending lever 89 attached to a transversely extending operating shaft 96 which extends through the upright side walls of the frame 42 and is provided with an operating lever and handle 9| on each side of the mining machine so that the clutch for engaging and disengaging the cutter chain 46 may be operated from either side of the machine.

Meshing with the bevel gear 82 is a bevel gear 92 mounted on a horizontal longitudinally extending shaft 93 provided with an integral power take-off head 8d, thus providing a power take-off mechanism whereby the driving motor of the mining machine may be employed to drive a supporting truck in a manner well understood in the art, whenever the gummer or cuttings removing mechanism 43 is not attached to the machine. When said gummer or cuttings removing mechanism i3 is attached to the machine, it is provided with mechanism to derive power from the power take-off 94 and in turn is provided with an extended power take-off so as still to provide for the truck drive.

The shaft 63 is mounted on spaced anti-friction ball bearings, one of which is held in a receiving cup or socket 95 attached to and forming in fact a part of the enclosing frame or housing section 22. This recessed cup or socket 95 provides a protecting enclosure for the power'takeoff head 94 and prevent this continuously rotating part being freely exposed where it might harm an individual when rotating.

It is obvious that the head 96 is directly and permanently connected to the drive shaft 59 so that it always rotates with said shaft 59 and in a direction determined by the direction of rotation thereof. The power take-off head 94 includes a plurality of spaced bores or holes 96 adapted to receive coupling pin 91 of an associated power receiving mechanism which may be that for driving the supporting truck for the mining machine or, as illustrated in Fig. 3 of the drawings, coupling pins 3'! provide a connecting means to the gummer or cuttings removing mechanism 43 by way of a drive shaft 96 mounted in spaced anti-friction ball hearings in the enclosing frame or casing 99 of the gummer R3.

The gummer 53 and associated mechanism are fully described in my parent application Serial No. 586,979. above identified, and it is claimed in my Patent No. 2,612,363 dated September 30, 1952, but it is pointed out in connection with this application that the drive shaft 98 of the gummer #3 drives a bevel gear which is in constant mesh with a pair of opposed and thus reversely driven bevel gears. These two reversely rotating gears, one of which is seen at lfll, mesh with a bevel gear I 82 that includes a stub shaft that interfits with and is keyed to shaft H3. Shaft H3 is mounted on spaced ball hearing on a power take-off socket orreceptacle. H4 formed integral with the summer casing 99. The shaft 113 is provided with a power take-oiT head 115 which is of generally similar construction to the head 9-! and is of similar function. That is, it provides a power take-ofi by which a supporting truck for the mining machine may be driven whenever the gummer is attached to the mining machine.

It may further be pointed out that there is a continuous or permanent drive between the shaft 59 and the power take-off 94 which, when the glimmer is attached, also continues to the power take-oil 1 15, and this gear train is uninterrupted by any clutches whatever so that when the gummer is attached the power take-off 115 always rotates with the motor shaft 59.

It may further be pointed out that the enclosure provided by the frame or casing of the machinery section 42 provides an oil containing compartment for the gears, shafts, bearings and mechanism therein and, of course, keeps it free of dirt. However, this compartment is not filled with oil, though oil is delivered to the various gears, bearings, etc, in a manner hereinafter described. This oil will flow from lower portions of the compartment provided by the bottom plate '11, through a drain opening 11'! (Fig. 3) in a transverse integral partition in the compartment and into an oil sump 118 which is provided adjacent the forward bottom portion of said enclosure provided by the frame 42. The oil sump 118 is provided with a removable bottom closure casting or plate 119 which is removably attached to the main casting of the frame or housing 32 by machine screws, as clearly illustrated in Fig. 3 of the drawings.

Attention is now directed particularly to Figs. 3 and 4 of the drawings, the latter of which shows drive gearing leading from the gear 82, shown in Fig. 3, to the drum 46. It is to be understood that a similar complementary drive gearing is provided on the left hand side of the machine, as viewed in Fig. 4, leading to the drum 4!). Such significant differences as exist will be mentioned. The gear 82 of Fig. 3 not only meshes with the power take-off driving gearing 92 previously described in connection with Fig. 3, but also continuously meshes with a pair of bevel gears, one on the right hand side which is seen in Fig. 4-, the other on the left hand side which is similar thereto but not illustrated, the gear seen in Fig. 4 being designated 210. Gear 2113 is keyed to a shaft 21 1.

Along each side of the machinery compartment 42 and forming subdivisions thereof is a pair of oil reservoirs, chambers or compartments which are adapted to be substantially filled with oil at all times, the oil reservoirs being designated generally 212, and being separated from the central machinery compartment which houses the shaft 69 etc. which is not generally filled with oil. and drains oil in the previously described sump 118. The separation of each reservoir 212 is by means of an irregular vertical integral Wall or partition 213.

As hereinafter described, oil is pumped into the two reservoirs 212 and when full the oil is free to flow through ports in the top of the partition 213 and into the central machinery chamber and finally into the sump I 18. For this purpose, each of the partitions 213 is provided with spaced top ports 214 and 215 at the front and rear, respectively (see Fig. 3)

The previously mentioned shaft 211 extends through the wall or partition 213 and is mounted on spaced anti-friction bearings, one of which is mounted in a cup in said wall, the other of which is mounted on a bracket formed integral with the frame 42. An oil seal 215 is provided between the shaft 211 and the wall 213, or, more accurately, between said wall and the hub of gear 218 to prevent the oil in the reservoir 212 flowing into the central machinery compartment.

Keyed to the shaft 211 and within the reservoir 212 is a spur gear 217 which meshes with and drives a gear 218 of an automatic one-way clutch 219 which include as a part thereof an operating cam 220 (see also Fig. 23), which cam 22! preferably operates a high pressure pump 221 and a relatively low pressure high volume sump pump 222, as illustrated in Fig. 23 of the drawings.

In the complete machine there will only be one of each of the pumps 221 and 222 and consequently there will not be one of each on each side of the machine. In the actual machine the two pumps 221 and 222 are operated by the cam 226 on the left hand side of the machine. rather than by the cam 226 which is actually illustrated in Fig. 4 of the drawings. It is entirely optional which cam 220 is employed, the other being present though not employed as a cam.

Mounted between the cam 221'] and the gear 218 is the outer race or driving member 223 of the clutch 219. The gear 218, cam 22!) and race 223 are removably held together by a plurality of through bolts 224 provided with appropriate nuts. This assembly constitutes the driving part of the one-way clutch 219 and it is mounted by a pair of spaced ball bearings 225 on an inner hub 226 which is keyed to a shaft 227. The hub 226 has a central clutching portion of irregular configuration, as best seen in Fig. 23 of the drawings. This central portion of the hub 225 is provided with four notches which receive four clutching rolls 228 which are urged into wedging contact with the outer race 223 by spring-operated pushers 229.

It is obvious by reference to Fig. 23 of the drawings that if the race 223 is driven in a clockwise direction, it will roll the rolls 228 against the spring pushers 229, which will provide for relatively free rotation of the driving member 223 of said clutch 219 and consequently will not drive the shaft 227. counterclockwise rotation of the race 223 will cause the rolls 228 to wedge between said race and the center portion of the hub 226 and thus automatically effeet a driving relation between the gear 218 and the shaft 221.

The shaft 227 extends from the oil reservoir 212 into the central portion of the machinery compartment through the previously mentioned partition 213 and by way of a splined coupling 239 drives the pinion shaft 22? on the left hand side of the machine. An appropriate oil seal 231 is provided for the shaft 22? as it passes through partition 213.

The coupling 230 is readily disconnectible by virtue of a pair of splined connecting sleeves 232 which are normally held in driving relation by removable cotter pins 233, but which when removed permit the sleeves 232 to be slid axially together, thus permitting ready removal of the coupling shaft 238 from the aligned projecting splined ends of the two complementary shafts 227.

By virtue of the coupling 230, it is, of course.

evident that both the right and left hand shafts 221 will always necessarily rotate in the same direction. Furthermore, this direction is so determined by the reversely operating automatic clutches 219 that the feed drums 48 and 49 always tend to rotate under the influence of the driving motor to pull in their associated feed ropes 55 and respectively, regardless of the direction of rotation of the driving motor within the motor section 4|.

In this connection it is, of course, evident that the complementary gears 210 on the right and left hand sides of the shaft 69 are driven in reverse directions by the gear 82 with which they are in mesh. Consequently, the shaft 2i I on the right hand side of the machine will operate in a reverse direction from that on the left hand side. As a result, the driving gears 2; of the two clutches 2 I 9 will always be rotating in reverse directions. However, since these clutches are reversely connected, one of them will drive the two shafts 221, one direct the other through the coupling 233, when the motor within the motor section 41 rotates in one direction and the other clutch 2I9 will drive said shafts when it rotates in reverse direction. The net result is that the two shafts 221 always rotate in the same direction regardless of the direction of rotation of the motor and this action is automatic.

The shaft 221 is the driving shaft of a variable hydraulic coupling mechanism 234 which is disclosed in some detail in Figs. 5, 6, and '1 of the drawings and which is a feature of considerable importance in the gear train of the mining machine between the motor and the final driving or feeding mechanism for the kerf cutter and it is to be particularly understood that this feature, as well as others, has utility not only in the particular mining machine herein illustrated, but in other similar types or quite different types of mining machines, including other shortwall machines, shortwall-longwall, longwall and arcwall machines. It produces a characteristic the feeding operation of a kerf cutter of a mining machine which is exceedingly desirable, particularly in that it provides a substantially uniform feed or, in the case where a feed rope is employed, it provides a substantially uniform pull on the feed rope for any setting of its control valve, which setting is preferably adjustable by an operator over a wide range.

Fundamentally, the hydraulic fluid coupling 234 is a hydraulic engine, pump or motor in which both the rotor and What is normally the stator are mounted for rotation, as Well as each being mounted for rotation relative to the other.

The driving shaft 221 of the fluid coupling 234' is rigidly connected to a main rotor body or casting 235 which is provided with a plurality of cylinders 236, there being three illustrated in the particular embodiment disclosed. Each of the cylinders 236 receives a reciprocating piston 231 which is urged upwardly by a spring 238. The head of each piston 231 is provided with a cam contacting roller 239 adapted to contact a removable cam 246 which is held between a pair of removable sections 2M and 242 of the casing or housing of said fluid coupling 234. The cam 240: is of such configuration as to cause reciprocation of the pistons 231 when there is relative rotation between the rotor 235 and the housing MI, 242.

The interior of the casing or housing 241, 242 is completely filled with oil at all times since it is submerged in oil in reservoir 212 and the oil therein is free to flow into said casing or housing by way of screened inlet ports 243 protected by filter screens 244 which are held in place by arouate strips 245 and screws 246. The oil within the casing 24 I 242 will flow into each of the cylinders 236, as the pistons 231 move upwardly by way of piston inlet ports 241 in the heads of said pistons 231, each of which is controlled by a one-way spring-pressed check valve 248. As each piston 231 moves inwardly, the oil in the cylinder 236 is forced through a spring-pressed ball. check valve 249 and a passageway 25!] which leads to a central bore, conduit or passageway 25! which is common to all of the feed passageways 256 and which is located at the axis of rotation of said rotor 235.

Reverting now to Fig. 4- of the drawings, it will be seen that a stationary conduit receiving fitting 252 is connected to the frame 42 and extends into the central bore 25l and is provided with a relatively high pressure stuffing box connection therewith to provide for rotation of the rotor 235 while the fitting 252 does not rotate. The left hand end of the shaft 221, as viewed in Fig. 4, is supported in the partition 2 l 3 by an anti-friction ball bearing 253.

The section 242 of the fluid coupling housing is provided with an integral neck 254 to which a gear 255 is keyed. The housing MI, 242 is supported on the shaft 221 by spaced anti-friction needle bearings 256 and 251 (see Fig.6) and the support for the right-hand end of said shaft221 is by way of bearing 251 and an anti-friction ball bearing 258 interposed between an integral cup 259 of the housing section MI and the outer upright wall of the frame 42, as clearly illustrated in Fig. 4 of the drawings.

' The shaft 221, of course, acts as the driving shaft of the fluid coupling 234, and the neck 254 in effect acts as the driven shaft thereof to drive the gear 255. Gear 255 drives a gear 260 of a two-speed planetary transmission 261 by way of a pair of intermediate reach gears 262 and 263.

The gear 266 is keyed to the driving hub or shaft 264 of the planetary transmission 26l which, per se, is of essentially standard construction and therefore will not be described in detail, except for certain novel features. This transmission is disclosed in some detail in Figs. 8 and 9 of the drawings.

The transmission 26! is supported as a unit on what constitutes the driven shaft .265 thereof, which is mounted in spaced anti-friction bearings 261 in the frame 42. As is customary with twospeed planetary transmissions of this type, it is provided with a high speed or fast friction band 268 and with a low speed or slow friction band 269. When the fast band 268 is tightened, a high speed drive is effected and when the slow band 269 is tightened a slow speed drive is effected. In the control system employed, one of these bands is always tightened and the other released so that a high or low speed connection is always provided. 7

Planetary transmissions are quite commonly employed, both as transmission or gear ratio changing devices and as clutches, as this is an inherent characteristic of the band construction which provides for progressive slowing down and ultimate stopping of their associated drums. In general, however, this action of contracting or tightening the bands is done slowly and generally by manually operable means to prevent too rapid application of the clutching action. In general it has been considered undesirable to provide high pressure type hydraulically controlled actuators ii inplist'oii meters i'oi tightening o1- applying the brake band's.

In my arrangement, however, the brake bands are einploy'e'd largely, though not exclusively, as rigid holding devices for their associated drums, since the clutching or flexible coupling action is provided by the hydraulic fluid coupling and in general once a brake band is applied, there will be substantially no slipping of the associated area. As a consequence, I am able to employ high pressure hydraulic actuators or piston o td'rs', one for each of the brake bands 2'66 and its or each or the two traumas-510 26!, there, of course, being one on each side of the machine individual to each drum 98 and M. This makes possible the provision of a very powerful but small in eahs for said brake bands 268 and 269.

As illustrated in Fig. 3 of the drawings, one end oiihe new band 253 is anchored to the Titanic 42 a bracket 219 and the Opposite end thereof is adjustable by means of an abutting piston 27 of ahydraulic piston motor :or actuator 212, which piston 21! abuts a brake band lug 213. sio'w band 269 is urged m slack or free position by a spring 219. It is obvious that by applying hydraulic fluid under pressure to the meter or actuator 212, the slow band 2E9 be clamped onto its drum to provide a slow eii 01' high reduction drive to the output shaft 265.

one nd c f the fast or high speed band 26B is anchored t a bracket 275 and the other end is blended with a lug 216 which is actuated by "a piston 27? of a high pressure hydraulic motor eisemaior 238 which is' located adjacent the actuator 212, but the piston extends downwardly afslo'p'ing direction, as clearly illustrated in Fig. 8 1a the drawings. Fast band 258 is urged to sites or free position by a spring 274.

As hereinafter described, a common operating -ifialv'e is provided 'for the actuators 21-2 and 278 which provides for their selective actuation. The shaft 265 is provided at its outer end with an integral sun gear 280, and an oil seal 28! is pievieee where said shaft extends through the outer upright 'wall of the frame '42 thereby preventing a loss of bil.

as illustrated in Fig. 4 'of the drawings, the spur gear 289 extends into the rope drum 4'8 and meshes with an internal gear 282 which is formed as "an integral part of a driving member of the drum, the "structure or which is best seen in Figs. 10 and 11 of the drawings. The drum 49 is as: similar structure, exce t it is n1ounted on the reverse "Side of the machine. The druin 4'8 includes a 'h'oll'ow supporting post 233 which has a large base reinovably attached to the outer right hand side can of the frame 32 and which carries a pair "of spaced anti friction bearings 28! which receive and support the hub of a main casting -28?) of the driven or rope receiving pornon of the drum 48. Jou'rnal'ed on a bearing on the outside of the hub of said casting 285 is the hub of a driving portion 28-5 of said drum 48-, or which the internal gear 282 is an integral part.

In operation, the driving member '286 and the driven member 285 are, of course, connected toge'ther by clutching means, and the rope '59 is wrapped about the external surface of the main casting 285 between inner flange 28': and outer image 298, the latter of which is formed on a removable plate "289 attached to the casting 285 by mamas screws. In a cylindrical well or secret fori'ne'd partially in the plate 289 and 12 partially in the casting 285 is an anchor button 299, to which one end of the cable 50 is anchored and held. v

To effect a selective driving or non-driving relation between the main casting 285 and the driving portion 286, a spider 29| is provided which hasa plurality of drive pins 292 extend ing through bushed openings in the casting 285 and adapted to extend selectively into aligned openings 293 in the driving member 286, thereby providing a clutching arrangement. Act'ua tion of said clutchis provided by a piston 294 formed integral with the spider 29! and extending into a cylinder295 formed in and along the axis of the post 283.

A spring 296 is received in a recess in the piston 294 and presses against the plate 289 to urge the pins 292 into clutch engaging position. A's illustrate'd in Fig. 11 of the drawings, the clutch is in its disengaged position and thus the rope receiving member of the drum 48 is free to rotate, subjectto some restriction as hereina'fter described. To provide for this disengaging action, at the left hand end, the post 283 carries an insert 291 which is a high pressure cylinder providing a hydraulic fluid receiving cham ber 298 into which anoper'atin'g piston 299 extends, the outerend of which abuts the spring pressed piston 294. It is thus obvious that bydraulic fluid delivered to the chamber 299 will act through piston 299 and piston 294 to disengage the clutch pins 292 and thus free the outer or driven member of the drum 48.

By reference to Fig. 4, it will be seen that hydraulic fluid is delivered to the chamber 298 by way of conduit 399 which is connected to the high pressure hydraulic system, as hereinafter described, by way of any desired fitting.

As best illustrated in Fig. 12 of the drawings, a plurality of spring-pressed friction buttons 39] are provided in cylindrical bores in casting 285 and are pressed by springs 392 against a face of the driving member 296. Thus when the clutch pins '29; are disengaged, an operator can pull the rope 5601f the drum 48 against a slight drag or friction which will prevent undesirable free rotation of the driven member of said drum 48. I

Figs. 23 and 24 of the drawings show in some detail the structure of the low pressure high volume sump pump 222 and the low volume high pressure pump 221. These pumps are of similar construction, though having different size cylinders and pistons. A detailed description of pump 221 will therefore 'suince for both.

Said pump 22 1 includes a cylinder 303 having a piston 394 therein, the exposed end of which is provided with a roller 305 adapted to roll on theca'ni 229 of one of the "clutches 2l9. A spring 3-66 urges the piston roller 305 into contact with the cam 2-2-0. Cylinder 303 is provided with "a removable head 30: having a suction condui't or passageway 308 therein which leads to the interior 6f cylinder 303 by way of springpress'ed check valve 399. As the piston 304 moves to the right or out of the cylinder 303, oil is sucked in by way of conduit 308 past the ball check valve 309. on the return stroke of the piston 304 the oil is forced out of it by way of exhaust or pressure conduit 310 (see Fig. 24-) past spring-pressed ball check valve 3!] and into a pressure or output pipe or conduit 3l2.

A's clearly indicated in Fig. 23, both of the pumps 2% and 222 are driven by the salne cam 220. 0bvio'usly, the direction 'of rotation of the 13 cam 22!] is immaterial to the action of these pumps.

Attention is now directed particularly to Figs. 13 to 22, inclusive, of the drawings, and to the structure of various valves and control or actuating mechanism therefor. It may first be noted that there are two similar combination valve assemblies which are of reverse construction, however, and which are adapted to be mounted on and demounted from the opposite rear corners of the section d2. These valve assemblies (see Fig. 19) are designated SIS and 3M, respectively, and their positions on the mining machine are illustrated best in Figs. 1 and 2 of the drawings. Except for the fact that one of them is a right hand device and the other a left hand device they are of substantially the same construction and a detailed description of valve 3E3 will suffice for an understanding of the structure of both.

Said valve assembly 313 includes a main body, block or casing 3 I5 and removable caps or heads tit and Si"; at opposite ends thereof. Located substantially at the center of the main body Bit and extending into both the caps or heads 316 and 3 is a cylindrical bore or opening 3H! which is the main cylinder of a balanced adjustable pressure relief valve which variably controls the slip and thus adjusts the torque of the iiuid coupling or, in other words, controls the pull in pounds on one of the feed ropes and 5!, there, of course, being an individual fluid coupling and an individual control valve for each drum A8 and it and associated reed ropes 5i and ill.

Stated another way, this control valve controls the pressure, and thus the torque, at which the fixed or unitary driving relation between the rotor 255 and the frame 2 2 52 is broken and their relative rotation starts with a consequent how of oil through hereinafter described valve 33%, The volume of said oil will be directly proportional to said slip, with zero volume at no slip or direct driving.

Within the cylinder 3 I8 is a helical spring 3 is, one end of which abuts a piston 32!}. let the other end and slidable in the cylinder 313 is a hollow sleeve 32! which is manually adjustable, as hereinafter described, to compress the spring 3E9.

As illustrated in Figs. 13 and 16 of the drawings, when the sleeve 32'! is moved to one extreme position, which is the zero pressure positio'n, it will move out of contact with the adjacent end of the spring 318. As the sleeve 322i is moved downwardly, as viewed in 13 or to the left, as viewed in Fig. 16, or, in other words, toward the piston 3%, it will travel a small pred ctermined distance before contacting the spring Sit and further continuous movement thereof will compress the spring 359 and thus buildup progressively the force exerted by the spring on said sleeve 32L This force is balanced by hydraulic flu-id pressure so the sleeve 32! will remain at any adjusted position.

The head 3 it is provided with an integral cylinder 322 which extends into the cylinder Bit and along the axis thereof and which on its outer cylindrical surface slidably receives a sleeve 323 having an integral head 82 i and a flanged base 3-25, which flanged base over-laps a flange on the sleeve 325 so that any force transmitted to the head 32 3 will be delivered by the sleeve 323 through the flanged base 325 to the sleeve 32!. Within the cylinder 322 is an "elon- 1* gated piston 326 adapted to push on the head 324.

As best seen in Fig. 16 of the drawings, the main casting 315 is provided with a hydraulic fluid inlet chamber 327 provided with an appropriate sealing ring 323 which will effect a seal with the flat plate of the frame 2 to which the block M5 is removably attached as a unit with tour through bolts which extend through four spaced holes 329 (see Fig. 15). It may be stated that this manner of providing connections between the large number of bores or passageways in the block or casing 315 is uniformly followed, thus providing for ready attachment or detachment of the combination valve assembly 3!? and insuring a leak proof connection with associated conduits.

Hydraulic fluid received in the inlet chamber 32? passes by Way of bores or passageways 3% in the block 315 and head M6 to the interior of cylinder 322, thus tending to move the piston 325 in a direction to compress the spring M9. This hydraulic fluid actually produces a balancing pressure to hold the sleeve 321 at any adjusted position, the result of which is to maintain the hydraulic fluid discharge from the associated torque converter 23-6 at a predetermined pressure which may be adjusted at any value from zero to the selected value, by the manual control means for sleeve 32!.

Hydraulic fluid under pressure delivered to the chamber 321 is also delivered to a pressure relief valve including a seal ring 331 (see Fig. 16) and a poppet 332 having a pair of integral spaced guide pistons 333 adapted to slide in a cylinder or bore are in the block 35. Bore 334 is open at its bottom, as seen in Fig. 14, and communicates with an open chamber 339 (see Figs. 13 and 14) which chamber 339 communicates with the int rior oi cylinder 31:; and with a large hole or opening 34% in the back upright plate of the frame 42, as clearly illustrated in Fig. 13 of the drawings, whereby the oil discharged through the high pressure relief valve 331, 332 will flow from cylinder 33% through chamber 339 and hole or opening 3% into an oil reservoir ,2l2. It is also evident from the above that oil in the cylinder 3 i8 is also drained to a reservoir 212 by way of chamber 339 and hole 34c. The head of the left hand guide piston 333, as viewed in Fig. 16, abuts a roller 3-35 mounted on one end of a pivoted arm 336, the other end of which arm carries a roller 33! which rides on the bottom of a groove in the piston 320, the groove being provided to receive said arm 338,

It is evident that any force developed by the compression of spring 313 will be transmitted through the pivot arm to the poppet 332 and consequently the pressure at which the relief valve 331, 332 opens will be determined by the position of the sleeve 32L Furthermore, the sleeve 32! will be balanced in any position to which it is adjusted, by virtue of the fact that the hydraulic fluid in the chamber 321 not only acts on'the pop-pet 332, but is delivered to the cylinder 322 and piston 326. The internal .diameter of the seal ring 331 is the same size as the internal diameter of the cylinder 322 and consequently, since the hydraulic iiuid operates on two similar areas in opposing directions, these forces will be balanced, thus maintaining the spring 31s compressed in any position to which it is once adjusted by adjusting the sleeve 32!.

The manner of adjusting the position of the 15 sleeve 32!, thereby to adjust the pull which will be exerted on the rope 50 or as the case may be, will now be described. Referring particularly to Fig. 13 of the drawings, it will be seen that an operating shaft 338 extends through spaced oil seals, through a bore in the cap 3!? and through a bore in the casing 3!5, and into and through the open chamber 339. This operating shaft 338 is mounted for both rotary and longitudinal, reciprocatory or axial movement, the rotary motion being employed to control variably the pressure at which the relief valve 33!, 332 operates, by adjusting the sleeve 32!, and the reciprocatory motion being employed to energize selectively the hydraulic motors or actuators 212 and 218 for operating the two-speed planetary transmission 26! associated therewith.

The valve 3|3 is, of course, individual to one fluid coupling 234 and one planetary transmission 26!, while the valve 3M is individual to the other fluid couplin 234 and transmission 26!. Valve assembly 3!3 controls the fluid coupling and transmission on the right hand side of the machine, as viewed from the rear in Fig. 1, which controls the drum 48, and the valve 3M similarly controls the fluid coupling and transmission on the left hand side leading to drum 49. Valve assemblies 3!3 and 3!4 also have valves which control the clutch mechanisms 29!, 292, etc., of the drums 48 and 49, respectively, as hereinafter described more completely.

Rotary motion of the operating shaft 338 may be imparted thereto by an operating knob or handle 34! and this rotary motion is transmitted to a bevel inion 342 (see Figs. 13 and 14), which is feathered to the shaft 338, thereby providing for reciprocation of said shaft 333 With respect to said gear 342. Gear 342 meshes with a bevel pinion 343 (see Fig. 14), on the hub of which is a pinion 344, said two pinions being mounted for rotation on a shaft 345.

As best illustrated in Figs. 14 and 21 of the drawings, the pinion 344 meshes with a rack 335 formed as an integral part of the sleeve 32!. It is obvious, therefore, that by rotating the shaft 338 the sleeve 32! can be adjusted longitudinally along the cylinder 3!8 and, as previously described, the hydraulic fluid pressure at which the associated fluid coupling discharges will thereby be adjusted and this hydraulic fluid will produce a balanced condition on said fluid coupling control valve so that the discharge pressure thereof may be maintained substantially constant at any selected value from zero to the maximum discharge pressure. This, of course, will control the pull on the associated rope, such as the rope 50, and purely by way of illustration of the possible variation of this pull, it may be from zero to 20,000 pounds when the low speed of the transmission 26! is connected, which is the feeding speed used when the machine is cutting a kerf, or it may be from zero to 4000 pounds pull when the high speed of the transmission 26! is connected, which is the handling speed for the machine. These illustrative rope pulls are, of course, only such and are by no means to be considered as restricting.

It may further be mentioned that when the machine is in operation and being fed to cut a kerf the adjustment of the fluid coupling con- .trol valve at any value will operate to maintain 'a substantially constant pull on the feed rope and, consequently, the speed at which the machine Will be fed will be determined by the hardness of the cutting. For example, should the 16 coal be soft or easy to cut, the machine will cut rapidly. Where difficult cuttin is encountered, the machine will automatically compensate for the increased hardness of cutting, and feed through the coal at a slower rate.

It is to be particularly noted that this automatic control is responsive directly to the torque of the feed mechanism or, otherwise expressed, on the pull on the feed rope. Thus there is no time lag which need be overcome as is the case in those devices which atempt to control feeding speed by release responsive to overloading of the feeding or cutting motor. Experience indicates that this directly responsive type of feed control is much more satisfactory than other known types and eliminates all tendency for chattering, bucking and the like.

As previously mentioned, the shaft 338 is also employed to control the transmission 25E. This is accomplished by a single control valve operated by longitudinal, rectilinear or reciprocatory motion of the shaft 333. Said control valve includes a bore or cylinder 34'! provided in the casing 3!5 (see Fig. 13), into which a spool 348 reciprocates, said spool 348 being attached to or formed as an integral part of the shaft 338. Spool 348 includes a pair of spaced lands 349 and 353.

Adjacent its periphery the cylinder or bore 341 is provided with three circumferential chambers 35!, 352 and 353. The chamber 35! is connected by an appropriate conduit 354 to the slow band actuator or motor 212 of the associated planetary transmission 26! (see Fig. 25). The chamber 352 is connected with a high pressure or output pipe or conduit 355 (see Fig. 25), of the high pressure pump 22! over a path which includes a number of bores in the casing 3!5, which path will be described hereinafter. For the time being, it may be pointed out that this path includes a bore 356 (see Figs. 13 and 18), which communicates with the bottom of the chamber 352 and which is closed by a plug, the bore 356 communicating with a longitudinally extending bore 351 (see Figs. 13, 17 and 18), formed in the casing 3!5. The chamber 353 communicates by a conduit 358 with the fast band actuator 218 of the associated planetary transmission 26!.

With the spool 348 in the position illustrated in Fig. 13 of the drawings, the fast band piston motor 218 will be actuated, since hydraulic fluid under pressure in the chamber 352 will flow through the bore 341 to the chamber 358 which is in communication with said actuator or piston motor 218. Under these conditions, chamber 35! which communicates with the slow band piston motor 212 will be connected to drain by way of the rear end of bore 341 which communicates, by means of a passageway 359 in the head 3!6, with the interior of cylinder 3!8 which, as previously described, is connected to an oil reservoir 2!2.

As clearly illustrated, for example, in Figs. 13, 17 and 18 of the drawings, portions of the cylindrical periphery of the sleeve 32! are cut away to provide a free path for oil discharged from cylinder 341. Therefore, by pulling outwardly on the handle 34! a fast speed drive will be effected from the driving motor to the drum 48. By pushing the handle 34! inwardly, the spool 348 is, of course, also moved inwardly and pressure chamber 352 is placed in communication with chamber 35! to actuate the slow speed motor or actuator 212 and to connect the high speed motor or actuator 218to drain through the bore 3 41, which at its bottom, viewed in 13,-

also communicates with the interior of cylinder 388 over: an obvious bore or passageway.

It is, thus evident that the operating handle 34:! and the shaft 338 which it controls: serves a double function of controlling by different actions the pressure relief valve. for the associated fluid coupling and the two-speed planetary transmission which is driven through said fluid couplin 4 Attention is now directed particularly to'Eig. 21 of the drawings and to additional control provided by the valve assembly tlt. First of all, it "may be mentioned that in association with the previously mentioned gear 3% for adjusting sleeve 32 i there is provided a spring-pressed ball detent 368 which performs a double function of making a clicking noise as each tooth passes it, thereby indicating to the operator that 3 predetermined amount of adjustment has been eifeoted on the sleeve 32!, and also aiding to hold the said sleeve in adjusted; position to prevent hunting which ight be caused by vibration of the machine.

Furthermore, it may here, be mentioned that the operating handle 3d! and all similar operating handles are provided with a pointer or index, thus designating its position, the pointer being best seen in Fig. 2 of the drawings. Ihe po r. o x mple, m y p t. w d wh n the sleeve 32! is adjusted to its zero position, as illustrated in Figs. 13, 16 and 21' of; the drawings.

A control valve for the clutch ESL-98, etc, of the drum 48 is also provided in the valve 315?. sembly M3 and it is controlled automatically by the actuation of the sleeve 32?! under the rotary control of handle 34!. This control valve includes a cylindrical bore stl (see Fig. 21), formed in the casing tits, in which a spool 3,52 reciprocates. Spool 3'52 is provided with spaced lands 35.3 and Mi l and bore tfil is provided with spaced chambers 365 and 3%. Chamber 35.5 communicates with the chamber 298 of the actuating motor of clutch 29!, 29.2, etc., of drun 45 over the previously mentioned conduit which is formed by interconnected bores, pipes and the like, designated by reference character 3%.

The chamber 368 communicates with the high pressure conduit tl'ldleading from the high pres.- sure pump 22d over a bore in the block M55, as illustrated in Fig. 1'? of the drawings. This chains her 355 also communicates over a plugged bore in the casing 355 with the previously mentioned bore 355?, by which the hydraulic. fluid under pressure from pump 22% is delivered to the chamher 352 by Way of bore 358. As is hereinafter pointed out more completely, there are a number of bores in the block M5 by which the hydraulic fluid under pressure delivered from the high pressure conduit 3553, first to the chamber 366 and then to the bore 35's, is delivered to other control. valves, particularly spool slide valves which are employed to control the elevating jacks ill and t8.

Returning now to a consideration of the structure illustrated in 21, the right hand end of the spool 352 is provided with a rigidly attached operating arm 35'! which extends into the path of the sleeve 32!. abuts the head and extends into a recess in the spool 3'52, urging it to the left, as viewed in said Fig. 21.

When the sleeve 32;! is adjusted to the zero torque or zero pressure position so that the fluid A helical spring 3.53

th fdrum, d8 it will 'automaticallyfadiust the spool @52 so, as to; interconnect chambers 365 and,

365, thus delivering hydraulic fluid under. press t stren hs lutch t d um and disengagethe outer,- member of said drum, thus providing {or itsrelatively free rotation, as above ib d- As soon as: the sleeve 32!, is adjusted from its zero, torque or zero, pressure position or during; the portion of its travel before'it contacts the. are, th spool, 35} will operate under; the influence of the-spring 363 to block the presh mla r an 9 .1m the m cl tc motor mamber 3&5, to drain by way of open chamber thus draining the motor or piston actu o 2%, t e dr m a all n th n 28: th eo to p ate its c nd it d a d v n l-arise b e n he v g:-

membertilt and, thernaincasting: or. driven p01.- tion thereot. Thus, All; is efiectively connected to thedriving, motor; I54 through-th fluid r iee h ane ar m s n. s n incident to building up, the discharge pressure oi the fluid coupling and it is automatically dis,- conneeted rotatefreely as an incident to the reduction Q1? said: discharge pressure to zero.

adiacent its-rearportion-the combination valve assembly 3i? i reludes three similar slide valves including spools 355, $19; and 3-1! (see Fig. 14), adaptedto elide in. cylindrical bores $12, 3l'3and 5H4, respectively, formed the casing or block till. The slide valv 3&9, 312 controls the left front ,i aclg lit, the slide valve 310, 313- controls the right front jack 5,8, and the slide valve 311, SM; controls the two rear jacks 51 by way of conduits 3-1.5, 3:16 andi 311, respectively, which include a pluralityv of transversev and longitudisally connecting bores in the block 3l5, some of which are illustrated. in Figs. 13, 14, 15, 17 and 18 or the drawings.

The-structures of these three valves are similar and thus a description of valve 310, 3'13 which is disclosed detail in Fig. 13 of'the drawings willsuffice for an understanding of the construction of the other two'. Cylinder or bore 313 is provided. with a pressurdchambertlfi and, as clearly illustrated in Fig. 14 of the drawings, the three.- pressure chambers of: these threevalves are all connectedby interconnecting passageways or horses and they are connected with the previously mentioned pressure passageway 351 which extends to them by longitudinal and transverse bores; which may be seen by reference to Figsf i3 and 14 of the dra-wii'igs.- Thus, hydraulidfiuid under pressure from the pump 22 is available at all times in the vertically aligned chambers of said three valves, including chamber '3l8 and its counterpart in each ofthe other two valves.

scent-the bore 373 there isalso a motor chamhei which communicates with thepr'eviously mentioned conduit 3116 leadingto the right hand front jack 58.

Adjacent the bore 313 there are also spaced drain chambers 3,80. and; 38!,both of which are connected to, the interior of cylinder 318 over 6bv-lous drain bores seen in Fig. 13 of the drawings. 157- hi the drain chamber t8| there is a spool centering spring 332 which will return the spool are its center position, as illstrated in Fig. 1.3, When ver ts molesting Ope tin en s are ee e i- Q l se ls ,3 a e P i d a en th projecting operating portions of the. spool 37o.

It s iate by r erenc to -is f e era-vinesha Osmos en s of th rm s 36S! 19 318 and 311 extend outwardly from the casin body or block 315 and thus may be readily operated in reverse directions by pushing on opposite ends of them.

By reference to Fig. 25 ofthe drawings, it will be seen that these three valves having spools 369, 318 and 311 of the two valve assemblies 313 and 3 M are connected in parallel in pairs so that the operation of either spool 369 of the valve 313 or the valve 314 will control the front left hand jack 58 either to expand it or to contract it. Similarly controlling either spool 310 of valve 313 or 314 will control right hand front jack 58. Likewise, controlling the spool 311 of either valve 3i3 or 314 will control the two rear jacks 51.

Referring again to Fig. 13, it will be seen that the spool 319 is provided with spaced lands 385 and 396 which co-operate with the chambers 318 and 319 to control the expansion, contraction or locking of the controlled jacks in position.

When the parts are in their normal positions, as illustrated in Fig. 13, land 386 looks the control jack 58 in any position to which it is adjusted. If the spool 31!] is moved upwardly, as viewed in 13, hydraulic fluid under pressure in chamber .18 will be communicated to chamber 319 to expand the associated jack. If the spool 31!] is moved downwardly, as viewed in said figure, the motor or jack chamber 319 will communicate with the drain chamber 389 and thus permit the associated jack to contract under the weight of the mining machine.

Not only does the operator have control of one torque converter, a feed rope drum and a twospeed planetary gear by operation of a single shaft 338 and handle 341 which controls a multiple control valve 313 which is individual thereto, but dual controls are provided for each of the multiple control valves 313 and 314 whereby both of said valves may be controlled from either side of the machine and thus an operator on either side may control both fluid couplings, drums and transmissions.

In Fig. 19 of the drawings the structure which provides for the dual control of each valve 313 and 314 is disclosed. Some of the mechanism, including particularly that designated valve 313, is also seen in Figs. 13 and 14 of the drawings.

As previously mentioned, the shaft 338 is mounted on the casing or block 315 and thus is removable as a unit with the unitary combination valve 313. Keyed rigidly to said shaft 338 is a gear 381.-

It may well be pointed out here that, seen by referring to Figs. 15 and 22 of the drawings, there is a lug or detent 338 formed on the casing or block 315 adjacent the gear 381 which is adapted to fit into a groove 389 (see Fig. 22) in the periphery of said gear 381 formed by removing one of the teeth. This detent and groove are so positioned that they are in alignment, as illustrated in Fig. 22, only when the handle 341 is rotated to its zero pressure position, or, in other words, rotated so that the parts are in the positions illustrated in Fig. 13 of the drawings.

Under these conditions, the shaft 338 and handle 341 can be reciprocated or moved rectilinearly since the detent 388 will clear the gear 381 by virtue of the groove 389. This requires the fluid coupling pressure relief valve to be returned to zero before it is possible to change the transmission speed. Whenever the knob or handle 341 is moved either to its full-out or full-in position, the gear will clear the detent or lug 388, for example, as illustrated in Fig. 15 of the draw- 20- ings where the knob is in its full out position which is the fast or high speed position.

Before describing in detail the complete gearing which provides for the pull control of each valve 313 and 314, it may be mentioned that this gearing is such that either operating handle will have a similar effect on its controlling valve when rotated in the same direction or when reciprocated in the same direction. That is, handle 341 when pulled out will effect a high speed drive of drum 48. Its associated handle will do the same thing. When either of said handles is pushed in, they will effect a low speed drive of the drum 48. Likewise, rotating either of said handles in a clockwise direction will increase the rope pull on rope 59 or, in other words, increase the torque of the fluid coupling. The same applies for the other controls of the combination valve 314.

Mounted on an arm 39!] (see Figs. 13 and 19), which is an integral part of the block 315, is a pair of wide faced meshing reach gears 391 which mesh with the gear 381 for all of its positions of adjustment produced by shifting the shaft 338, as above mentioned. The reach gears 391 reach to and drive a gear 392 rigidly attached to the end of a tubular drive shaft 393 which is mounted on spaced anti-friction bearings 394 carried in spaced partitions 213 of the two spaced oil reservoirs 212 on opposite sides of the machine.

At its right hand end, as viewed in Fig. 19, the tubular shaft 393 carries a rigidly attached shrouded gear 395 which meshes with and drives a gear 396 fixed to a longitudinally slidable shaft 391 provided with a second rigidly attached gear 398 meshing with and driving a second shrouded gear 399 which is rigidly attached to a hollow shaft 480 extending through the oil seals in a side wall of the casing 42 and provided with an operating handle or knob 401. If the knob 341 is rotated in a clockwise direction, as viewed by an operator facing it, it will drive the knob 401 in a clockwise direction, as viewed by an operator facing it, through the gears 381, 391, 392, shaft 393, gears 395, 396 and shaft 391, and gears 398 and 339.

Provision is also made so that reciprocatory or rectilinear outward and inward movement of the handle 341 and shaft 338 will produce similar outward and inward movement of the knob or handle 401 and shaft 400. To this end, also extending through the hole or opening 340, as does the arm 390, there is a pivot arm 4112 removably attached to the block 315 (see Fig. 15), upon which a bifurcated double ended pivoted shipper 493 is mounted for pivotal movement about an upright pivot pin 404. The double ended shipper 403 co-operates with grooved collars formed integral with the gears 381 and 393 so that when gear 381 is moved inwardly, gear 392 and with it shaft 393 will move outwardly, and vice versa.

It may be mentioned here that when the com-- bination valve 313 is removed as a unit, the shipper 403 and gears 391 will be removed with it and the co-operating bifurcated arms of the shipper 403 are engageable with and disengageable from the collar of gear 392 by the simple expedient of slipping them on and off said collar.

Rectilinear, longitudinal or reciprocatory motions thus transmitted to the hollow shaft 393 will be further transmitted by the shrouded gear 395 to reciprocate shaft 391 and its two gears 396 and 398, the latter of which will in turn transmit this motion to the shrouded gear 399 and its at- 

